What are the 4 types of jet engines?
Many aircraft use a form of the gas turbine engine to produce power for thrust. These engines are normally the turboprop, turboshaft, turbofan, and a few turbojet engines. Turbojet” is the former term for any turbine engine. Turbofans are usually more efficient than turbojets at subsonic speeds, but at high speeds their large frontal area generates more drag. Therefore, in supersonic flight, and in military and other aircraft where other considerations have a higher priority than fuel efficiency, fans tend to be smaller or absent.Turbojets have poor efficiency at low vehicle speeds, which limits their usefulness in vehicles other than aircraft. Turbojet engines have been used in isolated cases to power vehicles other than aircraft, typically for attempts on land speed records.Turbofans are more fuel-efficient than turbojets because they use bypass air to generate thrust, reducing the need to burn as much fuel. They are quieter, and offer better performance at subsonic speeds, making them ideal for commercial airliners.